one at a time dry,The key is to make sure your frame work is super strong enough so the planks wont pull the hull appart,cause each plank has about 5lbs of pullback strenth,5lbs aint alot until you have 20 planks all pulling 5lbs at a time,lol......thats why the atv is on top.One plank at a time,took about a 1/2 hour for all the planks.The wood does flex and curve alot.